Hatsune Mikuo

Hatsune Mikuo is the popular genderswap based on official Vocaloid Hatsune Miku.

Design
Mikuo's design is often reminiscent to that of Hatsune Miku, an official Vocaloid 2 developed and distributed by Crypton Future Media. Mikuo has no defined design, since it varies from artist to artist, although he is commonly seen wearing a sleeved shirt and pants. The most popular hairstyle for him is short with bangs, though a ponytail has been seen. In some cases, his left upper arm dons the red mark "01", which is Miku's series number, although it has been seen on many other parts of his body.

Personality and traits
Mikuo has no defined personality, as he is an open source character. His height, weight, and optimum voice settings are undefined as well. This is because portrayals of him vary from artist to artist, he's commonly portrayed as tall and muscular or of small stature with a build similar to Miku.

Source: Vocaloid Wiki
Mikuo came to be as a result of soft to extreme down pitching of Miku's songs, and possibly a desire to have Miku sound masculine. His visual characteristics followed soon after.

Mikuo's depiction varies; he's often portrayed as Miku's sibling, either as a twin or an older brother. And although he is one of the Vocaloid derivatives that continues to be popular, he is not officially recognized by Crypton Future Media.

Voice configuration
Having a history of being a mere Pitchloid, Mikuo was not easy to tune for Vocaloid; sometimes he still has hints of Miku's voice characteristics, or doesn't sound convincingly masculine. This limitation has since been overcome thanks to the efforts of many fans who wanted a proper configuration for Mikuo.

These configurations are also applicable to V3-- it is safe to ignore the Opening parameter. Additionally, the configuration can be applied to Hatsune Miku English; using it grants Mikuo the ability to sing in English.

These examples of configurations on the Fanloid wikia should not be viewed as being widely accepted or acknowledged by Crypton Future Media or Yamaha.

Notable media
The following songs were created by configuring Miku's voice in Vocaloid, not by merely down pitching existing songs with a third-party audio program.

Notable media: Aria-P
This producer made an album 'Dull Color Reliance' featuring 9 original songs using Mikuo and Miku.

Media trivia
In this song, Mikuo is a soldier. He sang about his lover (Miku) and his mission to destroy the 'yellow diva' (Rin). In the end, Mikuo was killed by a boy (Len) for revenge.
 * peace maker

An original song by Aria-P. In this song, Mikuo is shown to be a 'bug' in Miku's voicebank. The Master of the computer wants to update the voicebank so no 'bugs' will be seen ever again. This song is about Mikuo spending his last moments with Miku before his 'deletion'.
 * LIGHT

Relationships

 * The proposed fanon relationship appears to be popularized by pairing Mikuo with Megurine Luki, Megurine Luka's genderswap. And depending on the intention it is either brotherly or romantically.


 * And as previously mentioned, the relationship when paired with Hatsune Miku varies, though it is commonly established as being sibling related. In many cases the relationship between them is incestuous, meaning romantic, and siblings love.

Trivia

 * No one truly knows who first coined the name Mikuo.


 * The name ミクヲ (Mikuwo) or ミク♂ has also been seen, but both are not as frequently used as ミクオ (Mikuo).


 * Mikuo is among the first generation of Fanmade Vocaloids that are what today are called Pitchloids.


 * On 29th of May, it was known as 'Mikuo Day 2011'. A number of fanmade PVs, and covers using Mikuo were posted to celebrate that day, and can be found with the tag 'ミクオの日2011' in Nicovideo.

Gallery
Note; this is not a gallery for every fanart out there, just for reference